Manchester United are in crisis mode after their £35million move for Barcelona centre-back Yerry Mina collapsed.Manager Jose Mourinho is desperate for a new defender and has just four days to do that. Which teams do the best on Boxing Day in the Premier League era? Every current Premier League club’s best kit from the past decade However, that defender will not be Mina as United pulled the plug on a deal for the Colombian because of a row over agent’s fees.The Red Devils have showed an interest in the likes of Harry Maguire and Toby Alderweireld this summer, however, neither of those deals have come close to happening.According to The Sun, members of United’s hierarchy were outraged by Mina’s adviser Felipe Russo by asking for more and different payments.United’s transfer fixer Matt Judge flew off to Spain to try and get a deal over the line and a five-year contract was reportedly agreed. REVEALED England’s most successful clubs of the past decade, according to trophies won possible standings RANKED Latest Manchester United News gameday cracker How Man United could line up for Newcastle clash – will Pogba start? silverware 1 Where Ancelotti ranks with every Premier League boss for trophies won who plays? How the Premier League table could change after the Boxing Day fixtures Mourinho is keen to recruit another defender before the start of the new Premier League season Boxing Day fixtures: All nine Premier League games live on talkSPORT Top nine Premier League free transfers of the decade smart causal REVEALED But Russo has refused to budge on extras in the fee, including money due to him and Mina, 23.United play their final pre-season friendly against Bayern Munich in Germany tonight.However, that may not be at the forefront of Mourinho’s mind as he ponders what the plan of action will be between now and the deadline on Thursday.